Computed Tomography. Basic principles. V.G.Wimalasena Principal School of Radiography. Introduction. Computed tomography (CT) is a medical imaging method employing tomography . The word "tomography" is derived from the Greek tomos (slice) and graphein (to write).
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School of Radiography
Transmitted X-ray beam
Incident x-ray beam
The reduction of the beam intensity on passing through the material due to absorption plus scatter
The degree of attenuation is obtained by measuring and comparing the incident and transmitted intensities
More dense material
Less transmitted x-rays
More transmitted x-rays
Less dense material
To be continued ….CTComplementary2